thttpd is vulnerable to an underlying change made to the
start-stop-daemon command in the current stable Gentoo baselayout
package (version 1.12.6). In the new version, the start-stop-daemon
command performs a "chdir /" command just before starting the thttpd
process. In the Gentoo default configuration, this causes thttpd to
start with the document root set to "/", the sytem root directory.

Impact

When thttpd starts with the document root set to the system root
directory, all files on the system that are readable by the thttpd
process can be remotely accessed by unauthenticated users.

Workaround

Alter the THTTPD_OPTS variable in /etc/conf.d/thttpd to include the
"-d" option to specify the document root. Alternatively, modify the
THTTPD_OPTS variable in /etc/conf.d/thttpd to specify a thttpd.conf
file using the "-C" option, and then configure the "dir=" directive in
that thttpd.conf file.